Platen printing-press.



M. ROCKSTROH.

PLATEN PRINTING PRESS.

APPLICATION FILED APR. 10. 1914.

Patented. Oct. 26, 1915.

0.. wAsHmu'mN. D. C.

MAX ROCKSTROI-I, 0F KLEIN-SEIDLITZ, NEAR PIRNA, GERMANY.

PLATEN PRINTING-PRESS.

Application filed April 10, 1914.

To all whom it may cone-em Be it known that 1, MAX RocKs'rRoH, manufacturer, a subject of the King of Saxony, Germany, residing at Klein-Sedlitz, near Pirna, Saxony, Germany, have invented certain new and useful Improvements in Platen Printing-Presses, of which the following is a specification.

My invention relates to a platen printing press comprising a platen mounted to rock about a shaft.

In order to move the platen parallel to itself before printing in such machines it has already been known to provide the platen with lateral arms having guide lugs which bear againstguide ways of the frame. This construction meets its purpose; it is expensive to manufacture, however, and in addition requires exceptionally precise workmanship.

According to my invention a material reduction in cost of the machine is obtained and the fitting of the requisite parts is reduced by steering the platen only by one closed cam in combination with two movable members which carry the rock shaft of the platen and run on two round guides rigidly connected with the frame. Owing to this arrangement the lateral arms having the guide lugs customary heretofore are done away with. An arrangement of great simplicity is obtained which in consequence of the less precise workmanship required possesses much less sensitiveness but nevertheless quite sufficient strength. The cam or its anti-friction roller is preferably arranged adjustable in height. Likewise, the platen can be shifted laterally 011 its rock shaft, such displacement being limited by adjustable rings or the like.

The subject-matter of the invent-ion is represented in the drawing in Figure 1 in side elevation, in which the platen is shown parallel to the form, and in Fig. 2 in rear elevation; Fig. 3 shows the platen when turned back.

copies of this patent may be obtained for five cents each, by addressing the Specification of Letters Patent.

Patented Oct. 28, 1915. Serial No. 830,960.

The platen a is steered solely by the swinging cam c which can be adjusted directly in height, or its roller can be so adjusted. The rock shaft Z) of the platen is journaled in slides (Z movable on two rods 6. The latter are suitably carried in eyes of the frame. In addition, as Fig. 2 shows, the platen can be laterally shifted on its rock shaft. After the platen has been adjusted on its shaft 7) its position is secured by adjustable rings f or the like. It will be readily understood that owing to the above described arrange ment the slides of the frame are entirely done away with.

Adjustment is effected in a vertical direction by the adjustable bearings h, in which a pin 2' is journaled, on which the cam 0 runs. The threaded stems of the bearings it are inserted into eyes 9 of the frame and can be adjusted in height by the nuts m. The platen is adjusted parallel to itself in a very simple manner by its being turned around for printing while the stems of the bearings h are loose and then tightening the nut of each bearing. The adjustable bearings may, of course, be arranged adjustable in height in any other manner.

I claim In a platen printing press, in combination, a platen, a rock shaft for said platen, two slides carrying said rock shaft and adapted to positively prevent any lateral movement of said platen, guides for said slides, adjust able bearings allowing a vertical adjustment of the platen, a pin journaled in said bearings, a slotted cam guided by said pin for steering the platen, and adjustable rings for securing said platen in its adjusted position.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

MAX ROCKSTROH. Witnesses:

PAUL ARRAS, WALTER STADELMANN.

Commissioner of Patents,

Washington, D. G. 

